Air-brake bleeder valve



.Aug.7,192s. 1,619,837

c. E. MARsHALl AIR BRAKE BLEEDER VALVE Filed April 2B, 1927 l /MW U -fa,f f4 y l f1 H501 nu* J Ii il Patented Aug. 7, 1928.

CLYDE E. MARSHALL, OF PEACH CREEK,` WEST VIRGINIA.

AIR-BRAKE BLEEDER VALVE.4

Application filed AApril 2B, 1927. Serial No. 187,262.

rlhis invention relates to air brake mechanism and more particularly tothe means 'lf'or reducing?, the air `pressure lo elle/ct release of thebrakes when required.

The invention provides a valve, lor relievv ing;- the pressure in theauxiliary air reser voir connected 'with the brake cylinder7 which isnormally held closed by the pressure in the train line, therebyobviating the provision thevusual valve seating spring and reducing thenumber ot parts.

lhe invention turlhermm'c provides means to iinevent the casualunseatinlg ot the valve by jar, or other causa when the pressure in thetrain line is cut cti.

The invention also aims to limit the move inentoi the valve plug andprevent displacement thereot' and assure its automatic seattinp; whenthe pressure is restored tothe train line to hold the pressure in theair reservoir and bralre cylinder. A

lllhile the drawing illustrates a preferred embodiment of the inventionit is to be understood that in adaptingr the means to meet spociiicneeds and requirements the design may be varied and such other changesin the minor details o't construction may be resorted to within thescope ot the invention as claimed, without departing from the spiritthereof. i

For a 'lull understanding ofthe invention and the merits thereof,reference is to be had to the following description `and the drawing;hereto attached, in which y Il*1 igure 1 represents a brake cylinder,auailiaryT air reservoir associated therewitlnand a bleeder valveembodying the invent-ion of an air hralre system.

Figure Q is an enlarged sectional view of the bleeder valve onthe line2--2 of Fig ure 1.

Figure 3 is a transverse sectional view on the line 3-3 ot Figure 2.

Figure if is a sectional view of a portion of the bleeder valve,showing, the valve plugr unseateih whereby to bleed the auxiliary airreservoir and brake cylinder.

Corresponding and like parts are referred to in the 'followingdescription and designated in the several views of the drawings by lilrereference characters.

The numeral 1a designates the brake cylinder, 9, the auxiliary airreservoir connected with the brake cylinder, and the 3 the usual triplevalve ot an air brake system. The train line 4J* is connected to thetriple valve opening.

duced portion 3 and head 2 and is adapted to obtain a seat upon theinner tapered end 8 oit a chamber 9 in which the head 2 obtains a snug'fit, and is 'free to have a limited movement. The casing 1 is formedwith a longitudinal opening or bore, which is en larger at one end toprovide the chamber 9 and which is reduced, as indicated at 10, tosnugly receive the reduced portion 3 of the "valve plug. y Theintermediate portion ofthe bore or opcninejot the valve casing 1 istapered, as indicated `at 11, to snugly receive the tapered portion 4Lot the plug valve and the opposite end portion of the opening is reducedto snugly receive the reduced end (i of the plug valve. Lateral openings13 and 14 are formed in a side ot the casing 1 an d. com municate attheir inner ends with the portions 19, and 10 of the longitudinal boreor These lateral openings 13 and 111 are positioned to receive betweenthem the tapered portion le ot the valve plug when the latter is seated,as indicated most clearly in Figure 2 ot the drawings. l/Vhen thevalveplup; is unseated, `as indicated in Figa ure L1v `oit the drawing,the openings 13 and. 111 are in communication with each other throughthe tapered portion 11 of the openinp; ilornied in the valve casing.Longitu dinal movement of the valve plug is limited by means of a pin15, 'which passes through a transverse opening intersecting thelongitudinal opening of the casing 1 and. entering a cut away portion 16of the valve plug. This also prevents displacement of the valve plugwhen unseated, as indicated most clearly in Figure 4. A lateral opening17 is formed in a side ot the casing 1 and constitutes an inlet and isdisposed between the outlets 13 and 14; and is in communication with thetapered portion 11 of the opening formed in the casing 1. A nipple orboss projects vfrom a side of the valve casing 1 to hold the latter inline with the opening 17 and provides means for coupling the valvel tothe air reservoir 2a. A' pipe 18 couples an end of the valve casing 1 tothe train line 4 thereby admitting of pressure from thetrain lineoperating uponl the head 2 of the valve plug seated as indicated inFigure 2. A springr ball catch 19 is located in a side of the casing 1ata point in the length of the chamber 9 to engage the end of the head 2and prevents casual unseating of the valve plug by jar, vibration, orother cause tending to accidentally unseat the valve and prematurelybleed, or relieve the pressure ovfthe'reservoir 2a and brake cylinder1a.

TheV end of. the valve casing. 1 opposite that coupled to the train line1a is widened, asl indicated 'at'.QO, and is slotted to receive anoperating member Q1 in which crimps 22am formed to receive pinsl 23extending across they slot formed in the widened' portion 20.v Oppositeend portions 24 ot the operating member 2l are reversely inclined andare adapted to have the torce applied e thereto 'for unseat'ing the plugot the bleeder valve, when it is required to relieve the pressure torelease the brakes. It is yobserved that thebleeder valve is normallyheld seated .by the pressure derived from the train line,

thereby dispensing With the usual spring employed for this purpose, andwhich constantly exerts a pressure to eH'ect a seating of the valve, andin consequence the brakcman is required to spend some considerable f'Y'time in operating each of the bleedervalves when itis required torelease the brakes, and which in the aggregate amounts to somevconsid-erable time. Ain instant'operation of the member 2l issufficient to vei'ect an unseating ofthe valve which remains open untilpres- 'sure is restored to the train Vline and the Y against the head 2of the pipe 18, and vwhich pressure operating plug valve effects aseating of the latter. Y

Having't'hus described the invention7 I claim y1. A bleeder valve for anair brake sys- ,tem-the'rsame comprising a casing having a longitudinalyopening therein and lateral openings, the longitudinal opening being.

adapted to be connected to the train line to receive pressure therefrom,and one ot the lateral openings being adapted to be connected vfith thebrake cylinder tor relieving the pressure thereof, a plug valve movablein the longitudinal opening oi the easing and adapted to be normallyheld seated by the pressure derived jtrom the train line to close thelateral opening in eonnnunieation with the brake cylinder., and meansmounted upon the oppositie end of the valve easing to eiiiect, anunseating` ol the valve ivhen required, said valve having' a portion euta\va v and a pin mounted in the valve easing' and entering the eut awayportion of the valve to limit its movement.

2. A bleeder valve Vtor an air brake system, the same comprising aeasing having a longitudinal openingv enlarged at one end, restricted atthe oppositie end and having an intermediate, tapered portion and aportion ot uni'form dian'ieter and having lateral openingijs leadingtromthe intermediate portion ot' the longitudinal opening, and a plug valvehaving portions in its length corresponding to the several parts of thelongitudinal opening ot the valve easing.

3. A bleeder valve 'lor an air brake system comprising` a casing adaptedto be connected at'. one end to the train line and intermediate'its endsto the bralre cylinder, and having` a longitiulinal opening which isenlarged at one end and tapered intermediate its ends, and having` inletand outlet openings leading from the tapered portion ot the longitudinalopening', the enlarged end portion of the longitudinal opening forming'a chamber having a valve .seat at its inner end, and a plug valve in thelongitudinal opening comprising an intermediate tapered portion and anenlarged end portion 'forming a pressure sustaining head operable in theaforesaid chamber and a. valve at the inner end ot the pressuresustaining head to close upon the said valve seat at the inner end ofthe chamber.

In testimony whereof; l allix my sig'xiature.

